<template>
  <div>
    <el-table :data="formatData" :row-style="showRow" v-bind="$attrs">
      <el-table-column v-if="columns.length === 0" width="150">
        <template slot-scope="scope">
          <span
            v-for="le in scope.row._level"
            class="ms-tree-space"
            :key="le"
          ></span>
          <span
            class="tree-ctrl"
            v-if="iconShow(0, scope.row)"
            @click="toggleExpanded(scope.$index)"
          >
            <i v-if="!scope.row._expanded" class="el-icon-plus"></i>
            <i v-else class="el-icon-minus"></i>
          </span>
          {{ scope.$index }}
        </template>
      </el-table-column>
      <el-table-column
        v-else
        v-for="(column, index) in columns"
        :key="column.value"
        :label="column.text"
        :width="column.width"
      >
        <template slot-scope="scope">
          <div v-if="index === 0">
            <span
              v-for="space in scope.row._level"
              class="ms-tree-space"
              :key="space"
            ></span>

            <span
              class="tree-ctrl"
              v-if="iconShow(index, scope.row)"
              @click="toggleExpanded(scope.$index)"
            >
              <i v-if="!scope.row._expanded" class="el-icon-plus"></i>
              <i v-else class="el-icon-minus"></i>
            </span>
            <slot
              :name="column.value"
              :row="scope.row"
              v-if="scopedSlots.indexOf(column.value) >= 0"
            ></slot>
            <template v-else>{{ scope.row[column.value] }}</template>
          </div>
          <div v-else-if="scopedSlots.indexOf(column.value) < 0">
            {{ scope.row[column.value] }}
          </div>
          <slot v-else :name="column.value" :row="scope.row"></slot>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
/*eslint-disable*/
import treeToArray from './eval'
export default {
  name: 'treeTable',
  props: {
    data: {
      type: [Array, Object],
      required: true
    },
    columns: {
      type: Array,
      default: () => []
    },
    evalFunc: Function,
    evalArgs: Array,
    expandAll: {
      type: Boolean,
      default: false
    },
    scopedSlots: {
      type: Array,
      default: () => {
        return []
      }
    }
  },
  computed: {
    // 格式化数据源
    formatData: function() {
      let tmp
      if (!Array.isArray(this.data)) {
        tmp = [this.data]
      } else {
        tmp = this.data
      }
      const func = this.evalFunc || treeToArray
      const args = this.evalArgs
        ? Array.concat([tmp, this.expandAll], this.evalArgs)
        : [tmp, this.expandAll]
      return func.apply(null, args)
    }
  },
  methods: {
    showRow: function(row) {
      let stylejson = {}

      const show = row.row.parent
        ? row.row.parent._expanded && row.row.parent._show
        : true
      row.row._show = show
      if (!show) {
        stylejson.display = 'none'
      }
      return show ? {} : stylejson
    },
    // 切换下级是否展开
    toggleExpanded: function(trIndex) {
      const record = this.formatData[trIndex]
      record._expanded = !record._expanded
    },
    // 图标显示
    iconShow(index, record) {
      return index === 0 && record.children && record.children.length > 0
    },
    loadformatData() {}
  }
}
</script>
<style rel="stylesheet/css">
@keyframes treeTableShow {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@-webkit-keyframes treeTableShow {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
</style>

<style lang="scss" rel="stylesheet/scss" scoped>
$color-blue: #2196f3;
$space-width: 18px;
.ms-tree-space {
  position: relative;
  top: 1px;
  display: inline-block;
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  width: $space-width;
  height: 14px;
  &::before {
    content: '';
  }
}
.processContainer {
  width: 100%;
  height: 100%;
}
table td {
  line-height: 26px;
}
.tree-ctrl {
  position: relative;
  cursor: pointer;
  color: $color-blue;
  margin-left: -$space-width;
}
</style>
